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LibWeb+WebContent+UI: Support image cursors

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The `cursor` property accepts a list of possible cursors, which behave
as a fallback: We use whichever cursor is the first available one. This
is a little complicated because initially, any remote images have not
loaded, so we need to use the fallback standard cursor, and then switch
to another when it loads.

So, ComputedValues stores a Vector of cursors, and then in EventHandler
we scan down that list until we find a cursor that's ready for use.

The spec defines cursors as being `<url>`, but allows for `<image>`
instead. That includes functions like `linear-gradient()`.

This commit implements image cursors in the Qt UI, but not AppKit.
This commit is contained in:
Sam Atkins
2025-02-20 12:17:29 +00:00
committed by Andreas Kling
parent fd2414ba35
commit bfd7ac1204
20 changed files with 297 additions and 170 deletions
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Libraries/LibWeb/Painting/PaintableBox.cpp
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@@ -1,6 +1,6 @@
/*
* Copyright (c) 2022-2023, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
* Copyright (c) 2025, Jelle Raaijmakers <jelle@ladybird.org>
*